Road scraper



March 11, 1930. E; A, WEE-Ks A 1,750,610

ROAD SCRAPER Filed Dec. 7. 1928 s sheets-sheet` 1 u-U f A TTRNE y? March 1l, 1.930.

5 Sheets-Sheet Filed Deo. '7J 1928 R Alu mlm ma o o o o o o o o o o o VW o o o o o o o o o o o N W m mm k m W K 1.9L rwInIn Ifxil, 1 l I'X m m :w h NN Il PM Q o ATTO/:NE XS March l1, 1930. E. A. WEEKS ROAD scRAPEB Filed Dec. 7, 1928 3 Sheets-Sheet 3 n l AV* INVENTO Ermef fl.. ll/uks TEM- ATTORNEYS- v Patented' Mar. 1 1, 1930 UNITED STATES PATEN'Iv OFFICE ERNEST A. WEEKS, OF KALAMIAZOO,l MICHIGAN, ASSIGNOR T0 ROOT SPRING- SCRAPER COMPANY, 0F KALAHAZOO, MICHIGAN ROAD semana Application led December 7, 1928. Serial No. 324,442.

This invention relates to improvements in road Scrapers adapted for attachment to trucks although the invention is available in other relations.

The objects of the invention are:

First, to provide an electric means for con trolling the scraper, lowering it to its work and elevating it to the carrying position.

Second, to provide such an electric means in combination with hydraulic control for the scraper. v

Third, to provide such an electric means in connection with a worm gear control for the sera r.

O jects pertaining to details and economieswill definitely appear from the detailed description tov follow. Structures which show preferred embodiments of my invention are illustrated in the accompanying drawing, in which:l

F 1 is a plan view of a portion of a truck chassis with my improved adiustable electric control scraper means in position, only so much of the chassis being shown as is necessary to understand my invention.

ig. 2 isa plan View somewhat reduced in dimension showing the disposition of the electric scraper actuating means and a special auxiliary electric generator in osition by the side of the engine for provi ing the necessary current for operation of the scraper control motor, though the usual starting battery is suiiicient for most of the service required. Y

Fig. 3 is an enlarged detail front elevation viewgof the scraper means as adapted to hydraulic control taken Jfrom the left hand of Fig. 1, only a portion of the scraper being shown.

' Fig. 4 is a detail sectional elevation on line 4-4 of Fig. 3 showing the connections of the hydraulic means for actuating the scraper and a return spring for balancing the weight and facilitating the operation.

Fig. 5 is an enlarged detail plan of the hydraulic cylinder and pump, partially in section on l1ne 5-5 of Figs. 3. 4 and 6.

Fig. -6 is an enlarged detail elevation of the pump and hydraulic cylinder connection taken from the right hand of Fig. 5.

\ elevate the same for transportation. 14 is a 3 of a scraper structure showing my invention adapted thereto or a worm drive and control of the scraper.

Fig. 11 is a detail sectionalelevation of said worm drive means taken on line 11-11 of Fig. 10.

The parts will be identified by their numerals of reference which are the same in all the views.

1 is the truck chassis. 2 is the truck cab. 3 is the supporting beam ,or hanger board for the scraper. 4, 4 are the angle bars securin the same to the truck chassis. 5 are curv i segments exactly similar at each side of the truck and secured by the hanger boards. 6 and 7 are the clamps for securing the hanger boards 3 adjustably in place. 8 is the scraper rockshaft preferably made of pipe. 9 is the scraper blade. 10, 10 are the C-shaped spring arms for carrying the scraper, this being the form illustrated here although the scraper maybe supported in any manner upon the rockshaft. 11 is the centering cable, partially broken away, to maintain the hangerA board centrally for adjustment. These parts are like those appearing in my concurrent patent applications.

12 is the hydraulic cylinder containing the piston 13 for actuating the rockshaft to control the scraper and rock it to its work and reversible rotary hydaulic pump of the gear type. Other styles of pump are available but not so efective. 15 is the reversible electric motor directly connected to the said 'reversible pump. 16 is an auxiliary electric gen-.

erator or other source of electric power for providing the current for actuating the reversible electric motor. An auxiliary gener` ator merely avoids the extra drain on the starting batteries which are also available. The batteries are not shown. 17 is the reverse control switch means located on the floor of the cab. 18 is an independent chain connection to the cut off valve for the hydraulic cylinder.

The relation of these parts will now be definitely pointed out, it not being purposed to detail the support and adjusting means for the scraper because that is made the subject of independent patent applications in my behalf and is not being claimed here in detail as it is not a part of the invention here disclosed.

The hydraulic cylinder 12 is secured to the hanger board 3 byU-bolt means 121. The piston head 13 is provided with double hydraulic packing for actuation in both directions. The piston rod 131 carries a cross head 132 which is connected by links 133 to.

rocker arm 81 on the rockshaft 8, so that when the hydraulic cylinder is actuated it acts through the links upon the rockshaft arm and raises or lowers the scraper as the case may be. Return springs 135 are provided to counterbalance the scraper, making it easy in operation either in raising or lowering.

The pump 14 is carried by the cylinder head and is connected by suitable means 140 to the electric motor 15. The pump 14 is provided with intermeshing Qrotary pump members 141 of the gear type revolving in close fitting bores and being reversible to drive oil, the actuating medium, through the passages 142 to and from the opposite ends of the hydraulic cylinder respectively through the port 143 for the right hand end and through the pipe 144 for the left hand end of the cylinder. A valve 145 is provided to control the passage and shut oit' the oil directly to the left hand end of the hydraulic cylinder when the pump is stopped, that being the port which it is necessary to positively shut to hold the scraperto its work. The oil is cut off from the opposite end also. The stem of valve 145 projects through stufingbox 146 and isprovided with control lever147 actuated by spring 148 holding the arm against av stop 149 to cut off the said cylinder and maintain the pressure.

The electric motor 15 is attached to the hanger board 3 by bolts 150. The electric motor 15 is a reversible motor and is connected by universal joint 140 to drive the pump 14. The motor is controlled by reversing switch placed in the cab and operated byv hand leve 171. The said lever 171 is provided with a control arm 172 which connects bycable 173 tothe valve arm 147. When the switch lever 171 is at neutral, the

valve is closed to the hydraulic cylinder.

When it is moved to either `forward or re verse the valve is opened so that the pump can drive the oil from one end of the cylinder 12 to the other andI actuate the piston to control the scraper. Automatically the valve is closed when the current is cut off and the pressure is maintained inthe left hand end of the hydraulic cylinder.

In Figs. 10 and 11, I show my electric means connected to a Worm gear control for the scraper. As pointed out, 18 is a worm ear segment secured to the scraper rocksha t 8. This is operated by worm 19 which is secured by bracket and housing 191 and bolts 192 to the hanger board 3. The bracket housing 191 embraces the Worm gear 20 which is carried on the shaft of the worm 19 and the driving worm gear 20 is driven by the worm 21, the shaft of which 211 projects and is connected by the universal joint 151 to driving shaft of the reversible motor 15. The convtrol connections to this motor are the same as the connections to the motor for the hydraulic cylinder except the connecting arm-172 is unnecessary to control the cut off valve to the cylinder.

It will be seen that by controlling the motor and driving the same ahead, or reversing that, the scraper can be efectively controlled, and as the worm gear locks the scraper is effectively controlled as'required.

The end of the shaft 211 projects at 212 and affords means for connecting a crank to manipulate this structure by hand in the event of the failure of the electric current supply or motor.

A hand pumpcan, of course, be provided for controlling the hydraulic means in the event of the `failure of the motor. I have not deemed it necessary to illustrate such as it is not necessarily a part of my invention.

Having thus described my invention, I de sire to state that it is capable ofgreat variations so far as the application of the electric power for manipulation of the scraper is concerned. I show both the hydraulic and the worm gear means mounted on the hanger board for controllin the scraper. There' are advantages for the n(hydraulic and there are advantages for the worin gear. I Wish to claim the same specificallyin the forms i1- lustrated and carried by the hanger board as .well as broadly as pointed out in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is: l

1. The combination with a truck chassis of adjustable scraper hanger board thereon, a. scraper rockshaft with scraper attached, carried by the said hanger board, a hydraulic cylinder. carried by the hanger board with connections for controlling the scraper to ele-` vate and lower the same, a reversible electric motor with hydraulic pump for controlling said hydraulic cylinder disposed on the hanger board, and switch means in the cab to con trol the electric motor with connection for piuting off the hydraulic cylinder, as speci- 2. In an actuating means for road Scrapers, the combination of a rockshaft, a scraper carried thereby, a hydraulic cylinder with double acting piston, connections from the said piston for operating'the said rockshaft, a reversible geared power pump connected to and associated with the said cylinder, a reversible electric motor connected with said power pump, a switch means in the cab for controlling the said motor, a shut off valve for the said hydraulic cylinder and a connection to the switch for actuating said valve to cut off the cylinder when the motor is stopped, as specified. l 3. The combination of a motor truck, a

hanger board therefor, a scraper on a rockshaft carried by the hanger board, an electric motor supported on the said hanger board, and power connections from the motor vfor operating the said scraper, as specified.

4. In an actuating means for road Scrapers, the combination of a rockshaft, a scraper carried thereby, a hydraulic cylinder with double acting piston, connections from the said piston for operating'the said ,rockshaf a geared power pump connected to and associated with the said cylinder, an electricl motor connected with said power pump, a'

switch means inthe cab for controlling the said motor, a shut olf means for the said hydraulic cylinder to cut oli' the cylinder when the motor is stopped, as specified.

In witness whereof I have hereunto set my hand.

ERNEST 4A. WEEKS. 

